code: def _union_counters(self, *sequences: Counter[T]) -> Counter[T]:
      union = sequences[0].copy()
      for s in sequences[1:]:
          union |= s
      return union
  
imports: from __future__ import annotations
  from collections import Counter
  from contextlib import suppress
  from typing import Sequence, TypeVar
  from ..libraries import prototype
  from ..utils import find_ngrams
label_desc: Use image node_id 14 for calling the Base obj's underlying member method code with example usage: obj._union_counters() and returns: union